With a two-digit factor you calculate in two steps and add up at the end.
This is how you do it:
1. First times the ones of the second factor. That is the first part line.
2. Then times the tens. This part line moves one place to the left.
3. Finally add the two part lines together.
Example: 25 · 12
25 · 2 = 50 and 25 · 1 = 25 (one place to the left).
50 + 250 = 300.
The numbers written in show the answer.
Example
For parents
What does this exercise practice?
Carrying out the standard written method of multiplication with a two-digit factor safely and adding the part products correctly.
Common pitfalls
Children often forget to move the second part line one place to the left, or add the part lines up wrongly. It helps to write the places neatly underneath each other.
How to practice at home
Check the shopping in writing, for example what 24 packs at 13 cents each cost.
Related: Written Addition, Semi-written multiplying, Inverse Operations